ain't 1

ain’t 1

in. is not. (see also If it ain’t broke don’t fix it, If it ain’t broke, fix it till it is, That ain’t hay!, There ain’t no such thing as a free lunch.) Saying “Ain’t ain’t in the dictionary” ain’t so.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.